Standard Features - Weekday/Weekend Programming - One program for the weekdays and a separate program for the weekends with 4 program periods per day - Easy to Use Basic operation keeps programming simple. - Backlit Display - Easy to read even in dimly lit rooms and hallways. - Early Start Function Adjusts the pre-heating/cooling of your home so you are comfortable at your programmed times. - Filter Change Reminder - Works with heating and cooling systems - Does not work with heat pump systems and electric baseboard heat (120-240V) - 1-Year Warranty